Blowtorch-valve



UNITED STATES FRANK K. LOW, OF MILWAUKEE, WISCONSIN.

BLOWTORCH-VALVE.

Specification of Letters Fatent.

Patented Nov. 22, 1921'.

Application filed May 17, 1920. Serial No. 382,088.

To all whom it may concern:

Be it known that I, FRANK K. Low, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in Blow torch-Valves, of which the following is" a specification. 1

This invention relates to improvements in valve especially adapted for use on' blow torches.

An important object of this inventionis to provide novel means" whereby the needle valve of a blow torch may be seated without the possibility of injuring or enlarging the valve seat or orifice at the rear end of the nozzle or jet of the blow torch.

The invention further aims to provide novel means whereby it is impossible to accidentally or through inexperience so'tightly engage the needle valve with its seat that the needle valve is caused to bind with the seat upon cooling.

A further object of the invention is to provide a valve for blow torches which is simple, desirable in use and cheap to manufacture.

Other objects and advantages of the invention will be apparent during the course of the following description.

In the accompanying drawing forming a part of this application and in which like numerals are employed to designate like parts throughout the same.

Figure 1 is a perspective of a blow torch having the improved valve.

Fig. 2 is a detail section through the torch illustrating the construction of the improved valve.

In the drawing wherein for the purpose of illustration is shown a preferred embodiment of the invention, the numeral 10 designates the reservoir or tank of a blow torch which, as illustrated in Fig. 1, has communication with the pump 11 provided with a hand operated plunger 12. As is usual in the construction of blow torches, a discharge pipe 13 extends upwardly from the reservoir and supports a nozzle or jet 14 having a plurality of apertures 15. The rear portion of the nozzle or jet 14 is provided with a valve casing 16 having communication with the supply pipe 13 through the medium of a depending tubular extension 18, The casing 16 is provided with a conical valve seat 20 which terminates in an orifice 21 establishing communication be.- tween the pipe 13 and the jet 14..

\Vith particular reference to Fig. 2, it will be noted that a valvestem 22 has its forward portion extending through the easing and provided with a conical. headv 23 adapted to engage the conical valve seat 20 for closing the orifice 21. 22 is of course threaded, as indicated at*25, through a rearwardly extending sleeve 28 of'the casing so that the conical head may by rotation in the proper direction, be engaged with or withdrawn from engagement with the conical valve seat. A pack 'ing nut 30 has threaded engagement with the sleeve 28 and surrounds the valve stem 22 for drawing an annular packing or gland 32 into gas-tight engagement with the'valve stem 22.1 I j e As the result of continued use of. the torch, the casing Ida-t thercar end of the nozzle becomes highly heated and the metal of course is caused to expand considerably and the valve seat 20 is thereby caused to enlarge and subsequently contract. Ordinarily when the conical head of the valve is engaged with the conical valve seat an excessive pressure is exerted in rotating the valve with the result that when the device cools the parts may not be easily separated.

To overcome the possibility of binding between the conical head 23 and the seat 20, I have threaded the rear portion of the valve, as indicated at 34, so that the handle 36 may be rotated with relation to the valve. As illustrated. in Fig. 2, a coil spring 38 surrounds the rear portion of the valve stem 22 and has its forward portion extended inwardly and securely confined within a radial opening 39 in the adjacent end portion of the stem. The rear portion of the coil spring 38 is extended rearwardly to form an arm 40 received within a recess 41 in the hub 42 of the handle. By this construction the handle is yieldably connected to the valve stem so that the rotary motion of the handle must be transmitted to the valve through the coil spring 88. The handle, however, upon being rotated causes the rotation of the valve stem until the head of the same is properly seated and any further efi'ort to more tightly seat the valve will result in contracting the coil spring. As the coil spring is contracted, the handle turns The valve stem upon the screw threads 35 and the operator is thereby immediately advised of the fact that the valve is properly seated. Upon the operator releasing the handle 36, the tension of the coil sprlng will cause the same to rotate and move to the rear portion of the V valve stem and it will flatly engage a nut 45 threaded on the rear portion of the stem The nut however, is held in position by fianging the rear portion of the stem as indicated at 48.

With reference to the foregoing description, it will be noted that it is impossible to cause binding between the head of the valve and the seat of the same as the result of excessive tension on the valve.

, Havlng'thusdescribed the invention, what .is claimed as new is:

.1. A device of the class described coinprlslng a casing having a conical valve seat,

7 a valve stem havinga conical head adapted to engage said valve seat, a handle carried by the said valve stem, and spring means yieldably connecting the handle to said valve steinL' 2. A device of the class described comprising a casing having a valve seat, a valve stemhaving a head adapted forengagernent with said valve seat, a handle threaded on the rear portion of said valve stem, and a coil spring surrounding said valve stem and.

secured at its ends to said handle and said valve stem for yieldably connecting the handle to the valve stem.

3. A device of the class described comprising a casing having a valve seat, a valve stem threaded into said casing and having a head adapted to engage said valve seat, the

4. In a blow torch, the combination with a discharge jet having a casing provided with a valve seat and a discharge orifice a valve stem threaded into said casing and having a head adapted for engaging said valve seat and closing said orifice, a handle threaded on said valve stern, and a coil spring secured at its ends to said handle and .saidvalve stein for yieldably connecting the handle to the valve stem whereby the rotary movement or the handle will be transmitted to the valvestein through the coil spring.

In testimony whereof I ELillX my signature.

. FRANK K. Low. a 8. 

